When they do these studies, they are always surprised that older people do at least as well on many tests as the young. Of course, they are usually done by students of about 20, who are never ever going to grow old.
"Those were the days, my friend...we thought they'd never end ...we'd live and love for ever and a day....We'd live the life we'd choose...we'd fight and never lose....for we were young and sure to have our way...."
The triumph of experience! Of course we have learned to use our brains more effectively and decisions are made faster when there is a wealth of background experience to help filter options! Hooray for the third agers...